You can fix the air stone migration by gluing it to the bottom of the rez with a hot glue gun - that will keep it in place. Also - you want the lights on at least 18 straight hours a day. Eight on and four off is not a good light cycle - it will make your plants do wierd shit. A good cycle would be 18 on, 6 off or 24 on. Hope that helps. How many nodes do the plants have? You might want to feed them with real mild (1/4 stength) nutes. The plants need very little nutes when they have 4 or less nodes. You should feed them gently at first - 1100ppm in veg is good for mid-late to late veg - to much for small plants. Stay greazy.